CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 30,637	$ 25,836
Foreign currency translation adjustments:
Foreign currency translation adjustments	(5,395)	(5,383)
Net investment hedge and long-term intercompany loan translation adjustments	(3,395)	(1,172)
Cash flow hedges:
Net loss recognized in other comprehensive loss	(380)	(234)
Reclassification adjustment for (gains) losses included in net earnings	(47)	24
Total cash flow hedges	(427)	(210)
Pension and other post-retirement benefits:
Pension and other post-retirement benefits actuarial gain amortization	(155)	(130)
Other comprehensive income (loss), before tax	(9,372)	(6,895)
Income tax benefit (expense) related to items of other comprehensive loss	(458)	(485)
Other comprehensive loss, net of tax	(9,830)	(7,380)
Comprehensive income	$ 20,807	$ 18,456